0 Assigned ID: 658 ----- Attempting Submission 1 (Fri Apr 10 18:41:46 GMT 2015) ----- Nuclear X-ray sources show that many low-mass early-type galaxies have central supermassive black holes. However, apart from the unusual Local Group galaxy M32, none of these black holes have measured dynamical masses. We show that using only existing data---archival HST imaging and published ground-based kinematic measurements---we can estimate the black hole masses and central mass-to-light ratios of a sample of 46 low-mass early-type galaxies. We will use these measurements to explore black hole demographics and scaling relations in this unexplored area of parameter space. We will also test the hypothesis that ultra-compact dwarf galaxies are the tidally stripped remnants of such low-mass early type galaxies. UNRESOLVED STELLAR POPULATIONS AND GALAXY STRUCTURE 0 Regular false false false false false SUPPORTED